Machine for sharpening gangs of saws.



Patented Dec. I9, i899.

2 Sheets-Sheet 2.

No. 639,358.' l 0.13MB.

MACHINE FOR SHARPENING GANGS 0F SAWS.

(Application filed Mar. 2, 1899.)

(Nu Model.)

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MM. MM# W Nrrnn States CHARLES CARR, OF BOSTON, MASSACHUSETTS;

MACHINE FOR SHARPENlNG'GANGS OF SAWS.

SPECIFICATION forming part of Letters Patent No. 639,358, dated December 19, `1899.

Original application tiled September 16, 1898. Serial No. 691,092. Divided and this application tiled March 2,1899. 4Serial No. 707,517. (No model.)

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Be it known that 1', CHARLES CARR, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improve men ts in Machines for Sharpening Gangs 0f Saws, of which the following is a specilication.

This application is a division of application led September 1G, 1898, Serial No. 691,099- machine for making and boxingmatches which application was divided under direction of the Patent Office.

The primary object of my invention is to produce a mechanism for rapidlyand economically sharpening the gangs of saws attached to machines for making match-splints, toothpicks, and the like; but my device may be applied for this purpose to any machine of which gangs of saws, circular or upright, are a feature.; and which device consists in the arrangement and combination of the several parts, as set forth in the following specication, taken in connection with the accompanying drawings, which form a part of this speciication.

In the drawings, Figure lis a side elevation of a saw-table with a gang of saws, forming a part of any machine of which gangs of saws are an essential feature, and shows the saw sharpening or grinding device attached to the table in position to operate on the saws. Fig. 2 is a front elevation of the same.

A grinding-wheel O2, of emery, carborundum, or other suitable substance, is secured to one end of a shaft, which is revolved by an electric motor C8 or other equivalent motive power. The motor C8 and the shaft-bearing are secured to the sliding plate C4, which is attached to the bed-plate by bolts in such a manner as to be easily adjusted horizontally in proper position by means ot' the screws O.

The bed-plate O5 is provided with a longitudinal groove to receive the sliding plate and is adjusted vertically in the cross-head slide O7 by a screw operated by the crank CB. The cross-head slide OPr is moved transversely on the cross-head O9 by means of the screw O10, turned by the crank C11. The cross-head O9 is secured permanently or temporarily to the saw-table by the bracket C12.

I do not limit myself to this precise arrangement of the various parts named, for some minor parts may beomitted and others added, as may be required by differences in the construction of the various machines to which the grinding device is t-o be applied, withoutl adecting the essential features of my invention. Nor do I limit myself to the precise location ofthe grinding device as shown in its relation to the saw-arbor. This device is also applicable to the grinding of other than gangs of circular saws. Operation: In the operation of grinding saws the saw-arbor O/ is held from turning by the detent orstop O13. The grinding-meel is then so adj usted by the inea-ns previously described or by equivalent mechanism that the beveled edge of the grinding-wheel engages one of the teeth of the rst one of the gang of saws. The motor O3 being started, the grinding-wheel is moved across lthe width of the saw-table by turning the crank C, and the edge of the wheel engages and grinds one tooth in succession of every saw in the gang, the saws being so mounted onto the arbor or in their frames that the teeth of each saw is in exact line with the corresponding teeth of all the other saws in the gang. When the farther end of the gang of saws has been passed by the grinding-wheel, the arbor is so turned or the saw-frame so moved as to present the next row of saw-teeth in position to be acted upon by the grinding-Wheel, the motor is reversed and the wheel is driven through the next line of saw-teeth, but in the opposite direction. This transverse movement of the cross-head slide is thus continued until all the teeth of every saw have been sufliciently sharpened. ,l The bur left by the grindingwheel upon the edge of the saw-teeth acts as a set and projects on opposite sides in each alternate row of teeth, and thus the cut on the stock is sufciently wide for clearance.

By means of the various adjusting movements described the relative angle of the beveled edge of the grinding-wheel may be so varied as to produce such a rake of the teeth of the saws as may be desirable. Thus by moving the slide O4, (see Fig. 1,) carrying the grinding-wheel O2, to the left from the center line of the saw-arbor and elevating the car- IOO riage C5 to keep the wheel in contact with the saws more rake to the saw-teeth will be given, or by moving the carriage C4 to the right and elevating the wheel to the saws less rake will be given to the saw-teeth.

Having described my invention, what I claim, and desire to secure by Letters Patent, is as follows:

1. In a machine for sharpening gangs of saws, a grinding-wheel of suitable substance having a beveled periphery, a motor coupled directly to the shaft or spindle of the grinding-wheel, a horizontally-moving sliding plate to which are rigidly secured the motor and bearings of the grinding-wheel shaft, screws to adjust the movement of thesliding plate in the grooves of the bed-plate, a verticali y-moving bed-plate, grooved to receive the sliding plate, a cross-head slide in which the bed-plate can be moved vertically by means of a screw and crank, a cross-head having a longitudinal screw with crank whereby the cross-head slide can be moved from end to end of the crosshead, parallel to the saw-arbor, and the brackets for attaching the cross-head to the sawtable, substantially as shown and described.

2. In a machine for sharpening gangs of saws, in combination with a saw-table bearing an arbor on which are saws, and provided with a stop or detent for limiting the movement of the saws to a tooth movement, a grinding-wheel of emery or like substance, an electric motor coupled directly to the shaft of the grinding-wheel and the described means for adjusting the relative position an angle of the grinding-wheel to the saws so as to grind and sharpen the teeth of the saws to any depth or rake, while they are held motionless by a detent and with their teeth in alinement substantially as shown and described.

scribed.

3. In a machine for sharpening gangs of saws, in combination with a saw table or frame having gangs of saws mounted thereon, a detent attached to the table or frame, a grindin g-wheel driven by an electric motor; means for adjusting the grinding-wheel to engage the teeth of the saws at any angle or depth; mechanism for moving the grinding-wheel parallel to the saw-arbor, from side to side, while the saws are held stationary by the detent, whereby the grinding-wheel may grind all of the saws in alternate rows and its reversed rotary motion forming burs on alternate sides, substantially as and for the purpose described.

4. In a machine for sharpening gangs of saws, the combination of the beveled-edge grinding-wheel C2 its operating-motor C3, the detent-wheel O4,tl1e detent C13, the horizontally-sliding plate C4 carrying the grindingwheel and motor, the vertically-movable bedplate C5, the transversely-movable cross-head slide C7 and the operating screws and cranks, substantially as and for the purpose de- 5. In a machine for sharpening gangs of saws, in combination with a saw-arbor carrying gangs of saws, a beveled-edge grindingwheel C2, its direct-connected driving-motor C3, the grinder-adjusting sliding plate C4, mounted on the sliding plate C, cross-head slide C7, elevating screw and crank C8, crosshead (19, screw C10, crank C, detent-wheel C14, detent C13 as and for the purpose described.

CHARLES CARR.

Witnesses:

CHARLES L. ELLIS, J AMES W. RIPLEY. 

